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Rowhouse rewiring
Narrow rowhouses often carry wiring from several eras, with small services in the basement. Gut renovations replace everything, while occupied homes are rewired room by room through floors and ceilings.
House RewiringLocal guide
The Baltimore electrical guide
History, housing, weather and rules that shape electrical work in Baltimore, MD.
An independent city
Baltimore separated from Baltimore County in 1851, and today the two are entirely separate governments. An address in Towson, Catonsville or Dundalk falls under Baltimore County, not the city, even though the mailing address may say Baltimore. Permits, inspections and contractor licensing requirements differ between the two, so the first step in any job is confirming which side of the line the property sits on.
The Baltimore rowhouse
Rowhouses make up the majority of Baltimore’s housing. Most are two or three stories, about fourteen to twenty feet wide, with a basement, a straight run of rooms from front to back and a small rear yard. Electrical services typically enter at the rear or basement, and the panel sits in the basement or a rear room. Because rowhouses share walls, new wiring runs between floor joists and through ceilings rather than along party walls, and fire-blocking must be restored after any opening.
Fells Point and Federal Hill
Fells Point, the old maritime neighborhood on the harbor, has some of the oldest houses in the city, including rowhouses from the 1700s with low ceilings and brick walls. Federal Hill, across the Inner Harbor, has Victorian rowhouses with roof decks. Renovations in both neighborhoods commonly add roof deck lighting and outlets, upgrade services to 200 amps and replace wiring that has been patched for a century. Both are in historic districts, so exterior work is reviewed by the city’s preservation commission.
Canton, Highlandtown and Patterson Park
East Baltimore rowhouse neighborhoods such as Canton, Highlandtown, Butchertown and the blocks around Patterson Park were built for industrial workers in the late 1800s and early 1900s. Many have been renovated by young buyers, often with rear additions, open floor plans and finished basements. These projects routinely include new services, panels and full rewiring, and homes that were never updated may still have knob-and-tube wiring or fuse boxes.
Formstone and exterior work
Formstone, a cement stucco shaped to look like stone, was applied to thousands of Baltimore rowhouse fronts from the 1930s through the 1950s. Some owners remove it to restore original brick. Exterior electrical work, such as new service entrances or lighting, must be attached carefully to Formstone or old brick, and service masts on rear walls need solid anchoring.
Hampden and the mill villages
Hampden and Woodberry grew around textile mills along the Jones Falls in the 1800s, and their small stone and brick rowhouses were built for mill workers. Today Hampden is known for its shops along 36th Street. Its tiny homes often have services of 60 amps or less and minimal circuits, and renovations there almost always begin with a service upgrade.
Charles Village, Bolton Hill and Mount Vernon
Charles Village, near Johns Hopkins University, has large three-story rowhouses with porches, many divided into apartments for students. Bolton Hill and Mount Vernon have grand brownstone and brick rowhouses from the mid-1800s. Converting multi-unit buildings back to single-family homes, or updating apartments, involves consolidating meters, upgrading services and rewiring each floor.
Roland Park and Guilford
Roland Park, one of the first planned suburbs in the country, and nearby Guilford and Homeland have large detached homes from the early 1900s under mature trees. These homes often have multiple panels added over the years, original wiring in the walls and long service drops through tree canopy. Storm damage to drops and masts is common, and renovations frequently consolidate panels and add generator connections.
Vacant homes and rehabilitation
Baltimore has thousands of vacant rowhouses, and city programs encourage their rehabilitation. Rehabbing a vacant typically means a complete new electrical system, since wiring has often been stripped, damaged by water or never updated. Each rehab requires permits and inspections, and BGE must set a new meter before the home can be occupied.
Basements, sewers and flooding
Many Baltimore rowhouse basements take on water from heavy rain, rising groundwater or sewer backups, and the city has worked under a federal consent decree to reduce sewer overflows. Panels, water heaters and furnaces in basements are vulnerable. Raising the panel, adding a sump pump with battery backup and installing backflow prevention reduce the risk of damage.
Tropical storms and the harbor
Tropical Storm Isabel in 2003 pushed a storm surge into the Inner Harbor, flooding Fells Point, Canton and other waterfront neighborhoods. Basements and first floors filled with water, ruining electrical equipment. Waterfront homeowners should keep critical equipment as high as practical and have an electrician inspect anything that has been submerged before power is restored.
The 2012 derecho
On June 29, 2012, a fast-moving line of storms called a derecho swept across Maryland, bringing down trees and wires during a heat wave. Hundreds of thousands of BGE customers lost power, some for a week. The storm showed the value of generators, battery backup for medical devices and prompt repair of damaged service masts.
Rowhouse fires and party walls
Because rowhouses share walls, a fire in one home can spread to neighbors. Overloaded circuits, space heaters and damaged cords are common causes. Interconnected smoke alarms, arc-fault protection and replacing outdated wiring protect not only the household but the entire block.
Heat pumps and electrification
Many Baltimore rowhouses use gas boilers or furnaces, but heat pumps are increasingly popular, supported by Maryland incentives and climate goals. Ductless systems suit rowhouses well. Each unit needs a dedicated circuit, and older homes often need a service upgrade first.
EV charging without driveways
Most Baltimore rowhouses have no driveway, so residents rely on street parking or rear alleys and parking pads. Homes with rear parking pads can sometimes add a charger, but street-parking residents depend on public chargers.
Maryland and Baltimore licensing
Maryland licenses master electricians through a state board, and Baltimore City also has its own electrical licensing requirements for work inside the city. Homeowners should confirm that their contractor is licensed for city work and that permits are pulled for panel changes, new circuits and service upgrades.
Typical Baltimore electrical jobs
Common requests include rowhouse rewiring, service upgrades, vacant rehab electrical systems, basement panel relocation, storm repairs, surge protection, heat pump circuits and roof deck lighting.
